rhythm contraception是什么意思

网络释义

用法例句

Innovate security management to guarantee survival and development of enterprises;

创新安全管理 保障企业生存发展

Application of grey correlation analysis approach to the urban eco-security evaluation;

灰关联分析在城市生态安全评价中的应用

Preliminary Study on the security of Backpacker Tourism in the remote countryside;

偏远农村地区背包旅游安全问题初步研究

Enterprise Safety Education Training;

浅谈企业开展安全教育的培训

Considerations on safety management of mechanics laboratory;

关于力学实验室安全管理的几点思考

Fire safety of the ships for aids to navigation engineering;

浅谈航标船舶的消防安全

Safty Design of Acrylic Ester Tank Area;

丙烯酸酯罐区的安全设计

E-mail s Safty in distance Education;

谈远程教育中电子邮件的安全防范

To Establish "China Setup of Safe, Disaster Reduction andEmergency" Must be Enforced;

建立“中国安全减灾及应急体系”势在必行

Raise worker quality and insure safe production;

提高矿工素质 确保安全生产